V	Set of vehicles
I	Set of n demand points + {0, n+1} where 0 and $n+1$ represent the dummy starting and ending nodes.
K	Set of relief centres (RCs)
G	Set of all resource types
T	Set of resource types for expendable resources
R	Set of resource types for non-expendable resources
$i,j,l$	Indices for demand points, $i,j,l\in \left\{\mathrm{0,1},\dots ,n,n+1\right\}$
v	Index for vehicle, $v\in \left\{1,\dots ,V\right\}$
k	Index for RCs, $k\in \left\{1,\dots ,K\right\}$
t	Index of resource types, $t\in G$